An object is to provide an inverter device capable of detecting the welding of a switching device in early stages, and in summary, the inverter device is equipped with a parallel circuit of a charging circuit and a switch connected between a battery and an inverter module, and comprises a capacitor charged from the battery via the charging circuit; a resistor to discharge the capacitor; a serial circuit including resistors to detect a voltage after the switch; and a diode connected between a connection point of the serial circuit including the resistors on a positive line and a connection point of the capacitor, and directed forward to the capacitor side.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An inverter module comprising a switching element group provided in a mold package to convert a DC voltage into a three-phase pseudo AC voltage by switching, the module further comprising: a diode provided between a DC power source and the switching element group and directed forward to the switching element group side; wherein the diode is integrally molded into the mold package.
2. The inverter module according to claim 1 , wherein there is provided a pin to connect, to a forward side of the diode, a capacitor charged from the DC power source via a charging device.
3. An inverter device comprising: an inverter coupled to a capacitor; a charging circuit connected to a DC power source and coupled to the capacitor via a diode; a switch connected in parallel with the charging circuit; and a voltage detection circuit for detecting voltage taken from a node between the switch and the diode.
4. The inverter device according to claim 3 , comprising a controller which judges whether the switching device is welded in accordance with a voltage detected by the voltage detection circuit.
5. The inverter device according to claim 4 , wherein the controller compares a voltage detected from a node between the DC power source and the switching device with the voltage detected by the voltage detection circuit, and when a difference therebetween is within a predetermined range, judges that the switching device is welded.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 12, 2005
October 21, 2008
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